Friday, 14 June 2013

Shelfchk is your Friend!

The Story

An invaluable learning experience over the weekend!

So, my task was pretty simple, hot add two DS14mk2 AT-FCX
shelves to one loop, and hot add another two DS14mk2 AT-FCX shelves to another
loop. Unfortunately, my diligence let me down and I failed to see that the
loops continued into cabinets further away, and managed to hot-add the shelves
into the middle of a loop twice - that’s this didn’t panic the controllers is
testimony to the resilience of NetApp FAS-Series Controllers (they are nearly
idiot proof)!

I had run the following command, but not given it the attention
it deserved:

fcstat device_map

Note: The command
for SAS shelves is

sasadmin expander_map

Also, the following command showed the secondary paths
going down and then coming up as expected during the hot adds:

storage show disk -p

And, I was even able to assign the disks after each shelf
hot-add (only doing one at a time with the FC shelves - okay to do more with
SAS):